| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | show Heap Fetches in EXPLAIN for index-only scans |
| Date: | 2012-01-13 15:21:22 |
| Message-ID: | CA+TgmoYwVhYkGJfNWz7DF3P5VPw-8qv97o8dwdhfpxf6O1tYfw@mail.gmail.com |
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| Lists: | pgsql-hackers |
I think that people who are using index-only scans are going to want
some way to find out the degree to which the scans are in fact
index-only.
So here's a 5-line patch that adds the number of heap fetches to the
EXPLAIN ANALYZE output. This might not be all the instrumentation
we'll ever want here, but I think we at least want this much.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
| Attachment | Content-Type | Size |
|---|---|---|
| explain-heap-fetches.patch | application/octet-stream | 1.5 KB |
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